Revolving-hook machine



' March 27,192s., 1,664,032

M HE MLEB REVOLVING HOOK MACHINE Filed March 1. 192a NVENTOR r maflmmwy TTORNEY Patented Mar. 27, 1928.

UNITED STATES PATENT OFFICE;

MARTIN HEMLEBLOE ELIZABETH, new JERSEY, ASSIGNOR TO THE sInGEa MANU- racrunme COMPANY, or ELIZABETH, NEW JERSEY, A CORPORATION 01! NEW JERSEY.

REVOLVING-Hook MACHINE.

This invention relates to an improvement in sewing machines of the revolving hook type. In some machines of this type the thread-case has a flange-and-groove connection with the loop-taker.wliiclnnot infre-, quently, becomes clogged during the operation of themachine .by particles of thread, lint or otherobstructions, necessitating disas'sembling ofthe parts in order .to remove.

it becomes necessary to remove any lint,

thread-ends or other obstruction which may have lodged between the supporting ledge of the loop-taker and thread-case during. the. operation of the machine or which may have. been deposited in the cavity uoffthe sewing machine bed-plate or work-support in which the lowen-thread-handling devices are located.' 7

In the preferred form of the improvement the-th'read-ca'se isof disk form withan open topped bobbin-cavity-having aside wall pro:

jecting above said body notched to expose.

the upper flange of a contained bobbin, the bobbin-cavity being arranged ecceiitrically to the axis of the loop-takeror hook farthest from-the needle-path so as to expose/the full area of the bobbin-cavity laterally of the adj acent'edge of thethroat-plate'for easy removal and insertion of the bobbin. The thread-case is removably mounted upon a supporting ledge of a cup-shaped loop-taker and restrained against rotation by a; fixed holding'or positioning plate secured-to the sewing machine bed-plate. To preventac'ci dental displacement of the thread-case from the loop-taker, while the bed-plate slide'is shifted, to replace a bobbin or while the sewing machine is tilted upon its hinges in adrop head cabinet or portable base, alock ingplate, overhanging the bearing flange of the thread-case, is provided. This plate is I secured upon one end by a pivot-screw to the sewing machine bed-plate or work-support while its other end is notched to receive,

a stop and'fastening screw also enteringthe bed-plate. The posi'tioning plate and. locking plate overlie different portions of then '1 bearing flangev and normally confine the thread-casein its operativeposition upon the loop-taker. NVhen the, stop-screwfis loosened the locking plate may be, readily swung to one side to clear the thread-case which whentilted, may be easily removed from the loop-taker for, convenience in clear-o ing the loop-taker cavity and loop-takerjof, 1 any lint or thread-ends which may. have lodged thereon so as to clog, theo free movement of the, loop-taker or which may have accumulated in the cavity ofrth wi ma: chine ,bed. I v. 1 V

In the accompanying drawings, Fig. 1 is an elevation of a portion of'afisewing ma chine to which the improvedthread-case mounting is. applied, the lower thread-handling mechanism being partly shownin sec tion through the line,AB of ,Fig'. 2.-Fig.

2 is a top plan view representing the lower thread-handling mechanism with the bedslide removed showing the holding andlock in section, with thread-case and; holding and locking plate and, 4; is a perspectivedesewing machine bed-plate ,or work-support,

ingplate in operative position. Fig. 3 is. a perspective detail ofthe 1oop-.tak er ,part1y,,

having adepending bearing lug 2 for-the;-

horizontal sha-ft 3, on the end. of which is se;v

cured the bevel gear l; meshing with the bevel gear 5-on the vertical loop-taker shaft Gjour naled in the bearingbushing 7 sustainediin the depending member 8 of the work s upport v by theset-screw 9. Thecollar 10 secured upon the vertical shaft vv6 bythe setscrew ll prevents longitudinah displacement of the shaft'in its bearing. Asplit case 12 encloses thebevel gears 4 and-5. Y I

Secured upon the upperend of the ver tical shaft 6 by means of agc'entral screw 13 and eccentric pin'le isythe cup-shaped hook or loop-taker '15 having an inwardly extending loop-seizing beak 16 and the usual throat 17 and loop-detaining shoulder 18. The upper edge of the hook or looptaker 15 is provided with an external flange 19 affording a ledge upon which rests the laterally extending disk or bearing flange 20 of the thread-case 21 of which the open topped cup-shaped body provides a cavity for the bobbin 22 disposed eccentric-ally to the loop-taker axis. The bearing flange 20 of the thread-case 21 hastwo substantially parallel faces of which the inner face rests upon the external flange 19 of the loop-taker 15 while the other of said faces is exposed beyond the bearing flange 19 of the loop taker. The thread-case is thus removably sustained by the loop-taker. The wall of the cavity of the thread-case 21 extends upwardly above the disk 20 and is provided in its upper edge with diametrically opposed finger notches 23 which extend below the upper flange of the bobbin 22 to enablethe latter to be readily grasped by the operator for removal when thebobbin is in normal operative' positionin the thread-case. The upstanding wall of the thread-case 21 is provided with the usual form of bobbin-thread tension spring 2 1.- v

By reference more particularly to Fig. 2, it will be observed that the thread-case 21 is so disposed within the field of action of the loop-taker 15 that the entire bobbin cavity is exposed laterally beyond the edge of the throat-plate25 so that by merely withdrawing bed-slide 26, normally covering the bobbin-cavity, the bobbin is readily accessible tothe operator for removal or replacement by another bobbin.

Secured upon the disk20of the threadcase is the pivotally mounted spring-pressed cushioning finger 27 entering a notch 28 in I a fixed holding or positioning plate 29 secured by a screw 30 in a slot 31in a depression of the work-support 1 beneath the bedslide 26. The holding plate, which restrains the thread-case 21 against turning with the loop-taker 15, is provided with a portion 32, adj acgit the spring-pressed finger 27, which overhangs one portion of the bearing flange of the thread-case 21 and normally confines the latter in its position upon the loop-taker duringsewing operation. Suiiicient threadclearance is provided in the notch 28 of the holding plate 29 entered by the cushioning finger '27 to afford easy escape of the needlethread loop as it'is cast about the mass of under thread upon the bobbin 22.

In order to prevent accidental displacement of the thread-case 21 from t-helooptaker during'the removal of a bobbin therefrom, or while the bed-slide 26 is withdrawn and the sewing machine is tilted upon its hinges in a drop-head cabinet or portable case, a locking plate 33 is provided. This plate is secured at one end upon the pivot screw 34 to the sewing machine work-support 1 in the depression-beneath the'bedcidental displacement of the thread-case: 21

I By reference. .to Fig. 1 it will also be observed that both the from the loop-taker 15.

holding plate 29 and the locking plate 33 are secured to the sewing'machine bed or,

work-plate below thellevel" of the throatplate 25 and below the plane of the uppermost portion of the upstanding notchedwalls of the thIQZLdrCZLSQ. Sufiicientthreadclearance is provided between the thread' case 21 and the overhanging portion of 'the locking plate 33 to afford free passage of the needle-thread loop.

When it is desired to remove the threadcase 21 from the loop-taker 15 forconvenience in clearing the loop-taker or loop-taker cavity in the work-support of any lint orthread-ends which may have accumulated thereon, the holding screw 36'is loosened and the locking plate 33 is swung to the dotted line position shown in Fig; 2 by-engagement of the lug 37 provided for the purpose whereupon the thread-case, when tilted, may be readily removed from the loop-taker.

The machine is provided with theusual feed-dog 38 carried by the feed-bar 3970pposed to which is the usual presser-foot 401 secured by the screw 41 upon the 'presserbar 42. Secured to the needle-bar 43 by'the needle-clamp 4: 1 isthe needle 45fwhichidescends within the field of action of the loops taker 21 in the formation of stitches in the usual and well known manner. c 1

It will be observed that the thread-case thread-handlingmechanism. n will be fur-.

ther observed that the locking plate 33 insures against accidentaldisplacement of the thread-case 21 from the loop-taker 15 when a bobbin of thread is removed from "the thread-case or when the thread from the bobbin is passed beneath the tension-spring 24. Thelocking plate 33further maintains the thread-case 21 in operativeposition upon 7 its loop-taker if, after the bed-slide 26' is withdrawn, the sewing machine should be tilted upon its hinges in a drop-head cabinet or portable base for access to the mechanism- 1. In a sewing machine, in combination I with a cup-shaped rotary hook and a threadcase with a bearing flange having one of two substantially parallel faces in external engagement with the rim of said hook and the other of said faces exposed beyond said hook, of a stationary holder overlying a portion of said exposed face of the bearing flange and having rotation-restrainin engagement with said thread-case, and a locking plate overlying another portion of said exposed faceof the bearing flange and manually retractible to uncover said bearing flange for permitting ready removal of. 'the'threadcase.

2. In a sewing machine, in combination with a cup-shaped rotaryhook and a threadcase with a bearing flange having one of two substantially parallel faces in external engagement with the rim of said hook and theother of said faces exposed beyond said hook, of a stationary holder overlying a portion of said exposed face of the bearing flange and having rotation restraining engagement with said thread-case, and a pivoted locking plate overlying another portion of said exposed face of the bearing flange and movablein a plane parallel with the plane of the bearing flange to uncover the latter and for permitting ready removal of the thread-case.

3. In a sewing machine, in combination, a work-support, a throat-plate mounted thereon, a cup-shaped rotary hook, a threadcase with a bearing flange having one of two substantially parallel faces in external engagement with the rim of said hook and the other of said faces exposed beyond said hook, a stationary jholder overlying a portion of said exposed face of the bearing flange and having rotation restraining engagement with said thread-case and a locking plate overlying another portion of said exposed face of the bearing flange and manually movable to uncover said bearing flange for permitting ready removal of the threadcase, said holder and locking'plate being mounted on the work-support below the level of the throat-plate. v

4. In a sewing maehine, in combination, a work-support, a throat-plate mounted there 7 on, a cup-shaped rotary hook, a thread-case with a bearing flange having one of two substantially parallel faces in external engagement with the rim of said hook andthe other of said faces exposed beyond said hook, a stationary holder overlying a portion of said exposed face of the bearing flange and having rotation restraining engagement with said thread-case and a locking plate overlying another portion of said exposed face of the bearing flange and manually retractible to uncover said bearing flange for permitting ready removal of the thread-case, said holder and locking plate being-disposed below the plane of the uppermost portion of the thread-case.

u-In'testimony whereof, I have signed my name to this specification.

MARTIN HEMLEB. 

